Stackable tray



FIG. 1 is a top plan view of a stackable tray showing my new design;

FIG. 2 is a front elevation thereof; the rear side elevation is similar to the front elevation shown;

FIG. 3 is a bottom plan thereof;

FIG. 4 is a left side elevation thereof; and

FIG. 5 is a right side elevation thereof. 

The ornamental design for the stackable tray, as shown and described. 